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|German TLR ( )|
|35 mm||Contaflex | Agfa Flexilette | Optima Reflex|
|4×4||Baby Rolleiflex (1931) | Baby Rolleiflex (1957)|
|6×6||Altiflex | Amplion Reflex | Brillant | Flektar | Flexo | Flexora | Flexora II | Flexora III | Foth-Flex | Ikoflex Ic | Ikoflex Ia Ikoflex Favorit | Mentorett | Montiflex | Peerflekta | Perfekta | Photina Reflex | Plascaflex | Plascaflex PS 35 | Plascaflex V 45 | Reflecta | Reflekta | Reflekta II | Rica Flex | Rocca Automatic | Rocca Super Reflex | Rolleiflex | Rolleicord | Rollop | Superb | Superflex | Trumpfreflex | Vitaflex | Weltaflex | Wirgin Reflex|
The Automatic Rolleiflex 4x4, popularly known as the "gray baby" Rolleiflex, was introduced in 1957, at an announced list price of USD $133.65. It is a knob-advance twin-lens reflex yielding 12 exposures of 4x4cm on 127 film. It has a Schneider Xenar 60/3.5 taking lens and a Heidosmat 60/2.8 viewing lens.
This model helped kick-start a brief boom for 38mm × 38mm "super slides" (whose slide mounts were the same external dimensions as 35mm slides, but offering a larger image area), and inspired several Japanese lookalikes such as the Yashica 44.
By 1959 the gray baby's advertised list price had dropped to USD $99.50,  perhaps a reflection of waning interest in the format.
| Grey Baby Rollei by Gilson Geoffrey|
- ↑ Popular Photography (USA) Volume 41 No. 1, July 1957. "IPEX; The Products" [Report on the March, 1957 International Photo Exhibition, Washington D.C.] pg.105.
- ↑ Modern Photography (USA) Volume 23 No. 9, September 1959. "Quality Counts" (advertisement), pg. 19.